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CK I see you reworked the front loader mast pivot shaft with 3/4" 1045. I just redid mine with 1" 1045. It was a lot of work cutting old bushings out with a hole saw. Drilling new ones to fit 1" shaft. Putting it all together to check for correct fit and welding the bushings in. I used E6010 to fit all gaps then E7018 to complete the welding. I added 3/16" think plates to ends of loader arms for added strength.
Looks to me like your doing a terrific job on getting your 646 Series B back into service.

The new, bigger front tires will make the back end look like it is sitting lower but that will make it so you can put more weight on the loader. And also you will lose some traction if it has factory...